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  1. V

    Bolts and Nuts for High-Temperature Applications – Ambiguities in European Standards

    Hello, Austenitic stainless steel bolts and nuts can be used in high-temperature applications, and their maximum temperature limit is quite high in the ASME Sec II Part D standard. For example, B8 grade (SS304) is allowed up to 816°C (though some technical limitations, like relaxation...
  2. V

    Chloride criteria in MR0175/ISO 15156-3 for austenitic stainless steels

    It is known that Austenitic stainless steels (SS304,SS316,…) are prone to SCC in chloride bearing environments. The chloride is normally controlled within a certain limit to prevent stress corrosion cracking. In some cases, such as hydrotest, standards normally suggest 50 ppm chloride...
  3. V

    PE/PP in Concentrated Sulfuric Acid Service

    According to the NACE SP0391 standard, polyethylene (PE) and polypropylene (PP) are prone to environmental cracking in concentrated sulfuric acid. The standard highlights that: “The likelihood of cracking increases with higher acid concentrations and temperature, and a careful review of the...
  4. V

    Determining the Fracture Mode: Brittle Fracture vs. Fatigue in a Pump Shaft

    Hello, A broken pump shaft made of 1.4021 stainless steel failed at room temperature. The broken surface looks smooth and shiny, with some sparkles when tilted. Under the microscope, the cracks mostly followed the grain boundaries (intergranular fracture), which usually points to brittle...

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